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from fastapi import FastAPI, UploadFile, File, Form, Depends, HTTPException, Request, Body
from fastapi.responses import JSONResponse
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker
from pydantic import BaseModel, EmailStr, validator
import uuid
import re
from config import settings
from services.ingestion import ingest_document
from services.rag import rag_query
from database.models import Base, Booking
from vectorstore.pinecone_client import index, get_namespace
from fastapi.middleware.cors import CORSMiddleware
frontend = settings.FRONTEND_URL
# ====================== DATABASE ======================
engine = create_async_engine(settings.DATABASE_URL, echo=False)
async_session = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
async def get_db():
async with async_session() as session:
yield session
# ====================== APP ======================
app = FastAPI(
title="Custom RAG",
description="Upload PDF → Chat → Book → New Chat",
version="2.0"
)
app.add_middleware(
CORSMiddleware,
allow_origins=[frontend, "http://localhost:5173"], # Use localhost only
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
# ====================== BOOKING MODEL ======================
class BookingRequest(BaseModel):
name: str
email: EmailStr
date: str
time: str
@validator("date")
def validate_date(cls, v):
if not re.match(r"^\d{4}-\d{2}-\d{2}$", v):
raise ValueError("Date must be YYYY-MM-DD")
return v
@validator("time")
def validate_time(cls, v):
if not re.match(r"^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$", v):
raise ValueError("Time must be HH:MM (24h)")
return v
# ====================== STARTUP ======================
@app.on_event("startup")
async def startup():
async with engine.begin() as conn:
await conn.run_sync(Base.metadata.create_all)
# ====================== ENDPOINTS ======================
@app.post("/upload")
async def upload_document(
request: Request,
file: UploadFile = File(...),
chunking_strategy: str = Form("recursive"),
db: AsyncSession = Depends(get_db)
):
print("="*50)
print("[UPLOAD] Request received")
print(f"[UPLOAD] All cookies: {dict(request.cookies)}")
if not file.filename.lower().endswith((".pdf", ".txt")):
raise HTTPException(400, detail="Only PDF/TXT allowed")
# Get or create session
session_id = request.cookies.get("session_id")
if not session_id:
session_id = str(uuid.uuid4())
print(f"[UPLOAD] Created NEW session: {session_id}")
else:
print(f"[UPLOAD] Using EXISTING session: {session_id}")
result = await ingest_document(file=file, strategy=chunking_strategy, session_id=session_id, db=db)
# Create response and set cookie
response = JSONResponse({
"status": "success",
"chunks": result["chunks"],
"message": "PDF uploaded successfully!",
"session_id": session_id # Send back for debugging
})
response.set_cookie(
key="session_id",
value=session_id,
httponly=False, # Allow JS to read
max_age=86400,
samesite="lax",
secure=False,
path="/",
domain=None # Don't set domain, let browser handle it
)
print(f"[UPLOAD] Response: Setting cookie session_id={session_id}")
print("="*50)
return response
@app.post("/chat")
async def chat(
request: Request,
message: str = Body(..., embed=True),
db: AsyncSession = Depends(get_db)
):
print("="*50)
print("[CHAT] Request received")
print(f"[CHAT] All cookies: {dict(request.cookies)}")
if not message.strip():
raise HTTPException(400, detail="Message required")
# Get or create session
session_id = request.cookies.get("session_id")
if not session_id:
session_id = str(uuid.uuid4())
print(f"[CHAT] Created NEW session: {session_id}")
else:
print(f"[CHAT] Using EXISTING session: {session_id}")
bot_response = await rag_query(session_id, message.strip())
# Create response and set cookie
response = JSONResponse({
"response": bot_response,
"session_id": session_id # Send back for debugging
})
response.set_cookie(
key="session_id",
value=session_id,
httponly=False,
max_age=86400,
samesite="lax",
secure=False,
path="/",
domain=None
)
print(f"[CHAT] Response: Setting cookie session_id={session_id}")
print("="*50)
return response
@app.post("/book-interview")
async def book_interview(
request: Request,
booking: BookingRequest,
db: AsyncSession = Depends(get_db)
):
print("="*50)
print("[BOOKING] Request received")
print(f"[BOOKING] All cookies: {dict(request.cookies)}")
session_id = request.cookies.get("session_id")
if not session_id:
session_id = str(uuid.uuid4())
print(f"[BOOKING] Created NEW session: {session_id}")
else:
print(f"[BOOKING] Using EXISTING session: {session_id}")
new_booking = Booking(
name=booking.name,
email=booking.email,
date=booking.date,
time=booking.time
)
db.add(new_booking)
await db.commit()
response = JSONResponse({
"status": "success",
"message": f"Interview booked for {booking.name} on {booking.date} at {booking.time}!",
"session_id": session_id
})
response.set_cookie(
key="session_id",
value=session_id,
httponly=False,
max_age=86400,
samesite="lax",
secure=False,
path="/"
)
print(f"[BOOKING] Response: Setting cookie session_id={session_id}")
print("="*50)
return response
@app.post("/new-chat")
async def new_chat(request: Request):
print("="*50)
print("[NEW-CHAT] Request received")
print(f"[NEW-CHAT] All cookies: {dict(request.cookies)}")
session_id = request.cookies.get("session_id")
if not session_id:
print("[NEW-CHAT] No session found")
return JSONResponse({"message": "No active session"})
print(f"[NEW-CHAT] Clearing session: {session_id}")
namespace = get_namespace(session_id)
try:
index.delete(namespace=namespace, delete_all=True)
print(f"[NEW-CHAT] Cleared Pinecone namespace: {namespace}")
except Exception as e:
print(f"[NEW-CHAT] Pinecone cleanup failed: {e}")
# Generate new session ID
new_session_id = str(uuid.uuid4())
print(f"[NEW-CHAT] New session ID: {new_session_id}")
response = JSONResponse({
"message": "New chat started! Previous document removed.",
"status": "ready_for_new_document",
"session_id": new_session_id
})
response.set_cookie(
key="session_id",
value=new_session_id,
httponly=False,
max_age=86400,
samesite="lax",
secure=False,
path="/",
domain=None
)
print(f"[NEW-CHAT] Response: Setting cookie session_id={new_session_id}")
print("="*50)
return response
@app.get("/")
async def root():
return {"message": "RAG API is running! Visit /docs"} |